No such thing as amateur racing in terms of controls. The same rules apply to everyone, assuming we are talking about competition under the mandate of a governing body with anti doping rules, such as the UCI.
You are not going to get a free pass because you are part of a study. Of course, you are unlikely to be tested unless you start winning races, so in practical terms this is more of a moral question. Are you prepared to break the rules you agreed to follow when you took out a racing licence?
I would think about the risk of being targeted for testing if it becomes known that you are participating in the trial.
I suspect that the trial organisers will be well aware of all these issues, and will provide very clear guidance about the implications. For an active athlete in a sanctioned sport, I am pretty sure it is going to be a no-no.